I've just started experimenting with this for social for PH. I'm a bit obsessed with getting correctly framed & sized cards for Twitter, and I've found this is the first GIF maker, you can use, setting the pixel ratio before capturing. Super useful!

More about GIPHY Capture

GIPHY CAPTURE is the best way to create GIFs on your Mac. Simple, powerful, free, and easy enough for pretty much everyone and even a few small mammals.